chem-201-chapter-8 - 1 Ionic Solutions In the past we have...

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Unformatted text preview: 10/31/11 1 Ionic Solutions In the past we have assumed that ions dissolved in aqueous solution behave as if no other ions were present—ideal solutions This allowed us to use concentrations to calculate important quantities such as solubility products, pH, concentrations, etc. Real ionic solutions have interactions between anions and cations that affect the behavior Ionic Solutions cation anion anion anion anion anion cation cation Ionic atmosphere Ionic Solutions The ionic atmosphere around an ion tends to reduce the charge of that particular ion seen by counter ions in solution Suppose we have a dilute solution of Ag + and Cl- ions K sp (AgCl) = 1.8 x 10-10 If we add NaNO 3 , what will happen to the solubility of AgCl? Ionic Solutions NaCl and AgNO 3 are completely soluble salts, so they will not precipitate out Na + ions will tend to gather around the Cl- ions, and NO 3- will tend to gather around Ag + creating stronger ionic atmospheres around each NO 3- surrounding Ag + will tend to mask the positive charge of Ag + seen by the Cl- anion reducing the attraction between the two Ionic Solutions Consequently, the solubility of AgCl will increase with the presence of spectator ions NaNO 3 increases the ionic strength of the solution—Na + and NO 3- do not participate in any chemistry, but they affect the chemistry of other ionic species The behavior of any ionic solution depends...
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chem-201-chapter-8 - 1 Ionic Solutions In the past we have...

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